blue screen, vista not loading, error says stopped loading to prot

i have recently had a blue screen stating my computer would not continue to
protect my computer but it doesnt say why or even give me an error code. this
has happened over 4 times. i have to go to safe mode and use restore points
to git it to work again. i have not downloaded any new programs. how can i
find out what is causing this to happen?

OK Thanks


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Colt10mm